cuda error at cuctxcreate launch failed
I have a GTX 770 and I was having the same error but I was trying to use "Branched Path Tracing" instead of "Path Tracing" under sampling. I was able to cure it by turning down my tile my tile size under performance. I set my tile size to 64x64. I tested several different sizes up to 128x128(Mine would crash at any size larger) but 64x64 was by far the fastest on my GTX 770 2GB. It may be different on your GTX 1070. I also couldn't see what your sampling is set to so this might not even apply to what you're experiencing. It wouldn't hurt to try smaller tile sizes.